Here are some useful ceiling fan calculators that I have created over the past several years that are being used in various places on our website. I thought it might be a good idea to consolidate them all on a single page.
Operational Cost Calculator(Instructions/Details)
Use this to find a missing value when you only know 2 of the values. So basically, enter 2 values to calculate the missing value. What is the use for this? Suppose the manufacturer publishes the CFM on High and the CFM Weighted Average (Energy Guide CFM). You can use this to find the CFM on Low speed so you can get a true range of the fans performance.